(19)
(11) EP 0 930 167 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.12.1999 Bulletin 1999/50

(43) Date of publication A2:
21.07.1999 Bulletin 1999/29

(21) Application number: 98124046.8

(22) Date of filing: 17.12.1998
(51) International Patent Classification (IPC)6: B41J 2/16
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 18.12.1997 JP 34933597

(71) Applicant: CANON KABUSHIKI KAISHA
Tokyo (JP)

(72) Inventors:
  • Ozaki, Teruo
    Ohta-ku, Tokyo (JP)
  • Ogawa, Masahiko
    Ohta-ku, Tokyo (JP)
  • Hiroki, Tomoyuki
    Ohta-ku, Tokyo (JP)
  • Michizuki, Muga
    Ohta-ku, Tokyo (JP)

(74) Representative: Pellmann, Hans-Bernd, Dipl.-Ing. et al
Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Bavariaring 4
80336 München
80336 München (DE)

   


(54) Ink jet recording head, substrate for this head, manufacturing method of this substrate and ink jet recording apparatus


(57) In ink jet recording head in which a heating resistor (13) forming a heating portion (20), a wiring (14) electrically connected to the heating resistor, and a protecting film formed on the heating resistor and the wiring to protect the heating resistor and the wiring are arranged on a substrate (11) for the ink jet recording head, and an ink path communicated with a discharging port for discharging ink is formed on the substrate (11) for the ink jet recording head, the protecting film includes a first layer protecting film (15) for covering the heating resistor and the wiring, a second layer protecting film (16) formed on the first layer protecting film by a material different from that of the first layer protecting film and having an opening in a portion corresponding to the heating portion of the heating resistor and constructed by an inorganic material, and a third layer protecting film (17) constructed by the same material system as the first layer protecting film and covering the second layer protecting film and the first layer protecting film exposed from the opening.






Search report